Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c1d17bf96a2396…

MALICIOUS

PDF

80.4 KB Created: 2021-06-27 01:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10acc33734b8d93441d1e22151cfb451 SHA-1: b495209526cde0b20177f5277965f6164b925254 SHA-256: 85c1d17bf96a239663f851da553b8505777a2bd703b97567e721e6c28e7d2a9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress sites. These URLs appear to be part of a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=gat+sample+papers+with+solution
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4afce65c---6180849505.pdf
    • http://aqbnb.com/uploadfile/file/80471095135.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be771310ebd---zedurosifuwura.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073291b9d5f0---xebetadukiliviwulalokag.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcd506ec1---87631682074.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9b5c42c53---zupegagekonerive.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/pepilatizanobo.pdf
    • http://plusk-car.com/js/upload/files/vaxubuf.pdf
    • https://srmhospitalities.com/images/bulk_images/files/zegarebosuw.pdf
    • http://el-master.ru/userfiles/file/65687576203.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2ba9e6c5d43f98b717d02a7520e09e41/tovuvujanuji.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e34c5f6b5---82503414229.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851112c85b3---felunu.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607f114987136---zolexo.pdf
    • https://krono-original.vn/Images_upload/files/nesozidozukagasiduso.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/kfrqukcab9bjeonppta1boimv4/vexexefefuraremokegeli.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4d5732ac529d448bc09403b6f6a5bd02/pasowubirowap.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/ed3db54ae1230f521da718b90e0eba14/lekubaxedixa.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/tudibevaj.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/aeaa48db65f5a022b4af5b39281d9bf5/38281129723.pdf
    • http://thevisionkharj.com/userfiles/files/wuzobibelafatira.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7bada9b105c72ab2855f0342bfd7c2bf/jikoxagamamodorubaduwozon.pdf
    • https://lapdonline.org/file/82634651129.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c6.bin
6aafc22deba623948d37d45fa221b3d007f74b30446d3b98ade329daec63815f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 10740 bytes
font_01_sfnt_off0000ee5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 16792 bytes
font_02_sfnt_off0001066d.bin
0caa061932ddb2bc9fd1ca9fd6896d2292d5e9749d20826c3ee205bb7b125d41
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 17556 bytes